Mechanical pencil



FIG. 1 is a front elevational view of a mechanical pencil showing my new design;

FIG. 2 is a right side elevational view thereof, the left side being the same in apperaance as the right side;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a mechanical pencil, as shown and described. 